Nassella

Description

Nassella is a genus of grasses that are native to North and South America. It is commonly known as needlegrass, owing to the long-pointed awns that extend from the seed head. The genus contains around 100 species, with the most common species being Nassella tenuissima, also known as Mexican feather grass. Nassella is a popular ornamental grass due to its attractive appearance and low maintenance requirements.

Taxonomic Information

Domain	Eukaryota
Kingdom	Plantae
Phylum	Spermatophyta
Class	Liliopsida
Order	Poales
Family	Poaceae
Genus	Nassella

Appearance

Nassella grasses vary in appearance depending on the species, but they generally have long, slender leaves and a seed head that is held above the foliage on a tall stem. The seed head consists of numerous spikelets, each containing several flowers. The awns, or bristles, that extend from the spikelets can be up to 6 inches long, giving the grass a feathery appearance. The color of Nassella grasses ranges from green to blue-green, and some species have reddish-brown seed heads.

Care Guide

Nassella grasses are relatively low maintenance and easy to care for. Here are some tips:

• Water: Water the grass deeply once a week during the growing season, and reduce watering in the winter when the grass is dormant.
• Fertilization: Fertilize in the spring with a balanced, slow-release fertilizer.
• Soil: Nassella grasses prefer well-draining soil, but they can tolerate a range of soil types.
• Sunlight: These grasses prefer full sun, but they can tolerate some shade.
• Hardiness Zones: Nassella grasses are hardy in USDA zones 6-10.

Common Pests & Diseases

Nassella grasses are relatively pest and disease-free, but they can be susceptible to some problems:

• Spider mites: These pests can cause yellowing and browning of the grass blades.
• Root rot: Overwatering or poorly draining soil can cause root rot, which can be fatal to the plant.
• Fungal diseases: Nassella grasses can be susceptible to fungal diseases such as rust and leaf spot.

Habitat

Nassella grasses are native to North and South America and are found in a variety of habitats, including grasslands, meadows, and savannas. Some species are adapted to dry, arid conditions, while others prefer moist, well-drained soil. Nassella tenuissima, for example, is native to Mexico and thrives in hot, dry conditions.

Question and Answer

Q: Is Nassella tenuissima an invasive species?

A: Nassella tenuissima has become invasive in some areas outside of its native range, particularly in California. It can displace native plant species and alter ecosystems.

Q: Can Nassella grasses be used for erosion control?

A: Yes, Nassella grasses are often used for erosion control due to their deep root systems and ability to stabilize soil.

Q: How tall do Nassella grasses typically grow?

A: Nassella grasses can range in height from 1-6 feet, depending on the species.

Q: Are Nassella grasses deer-resistant?

A: Some Nassella grasses, such as Mexican feather grass, are deer-resistant due to their sharp, needle-like leaves.

Related Plants

• Stipa
• Pennisetum
• Miscanthus
• Calamagrostis

References

• “Nassella.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderProfileResults.aspx?taxonid=285871.
• “Mexican feather grass (Nassella tenuissima).” PlantRight, www.plantright.org/plant/nassella-tenuissima-mexican-feather-grass.
• “Ornamental Grasses.” Royal Horticultural Society, www.rhs.org.uk/plants/popular/ornamental-grasses/nassella.